Hmmmm....
There are a hundred centimeters in a meter right? so one hundred and seventy meters would be somewhere between five and six feet wouldn't it? In other words normal Human height not exactly a giant.
Okay, maybe this Topilsky and his guerilla fighters couldn't bring back the whole body but how about pictures? Hair samples? Heck maybe cut off its head! At least they could have made careful note of the location of the cave so somebody could go back with better equipment and dig up the 'Almas' remains. It certainly is unfortunate that the only good description of an Alma body dates back to 1925.
Later sightings are just that - sightings, and undoubtedly colored by preconceptions and fear assuming they aren't tall tales that is.
*Assuming* - and it's a big assumption - that Almas do exist my bet is they are nothing more than an unusually hirsute variation of good old Homo Sapiens Sapiens. Especially given that they are supposed to be able to interbreed with other Humans.